Retrotec DM32X User Manual

Page 48 of 80
© Retrotec 2022
8. What to do if you have trouble with the gauge
Knowing the common causes of erroneous readings will increase your confidence in the results. It is often
assumed the gauge must be regularly calibrated in order to get accurate readings, but this thought
obscures the fact that most gauge problems do not result from incorrect calibrations. The following list
provides approximate percent probabilities based on our experience for certain types of gauge problems.
Notice that gauge calibration is one of the smallest, and even that can usually be eliminated by following
the gauge check procedures in section 7 this manual.
Table 2: Causes of common problems with gauges
Problem caused by
Error frequency
Error range
Comments
Tubing is crimped shut
5%
25 to 90%
Usually noticeable because gauge does not move, but the
blockage may be partial, which could cause an erroneous
result.
Water in tubing
10%
75-90%
Possible only in wet areas. If gauges sent in to be
repaired or calibrated, the water evaporates and the user
never discovers the cause.
Improper Device selected
2%
20 to 90%
Not common because the wrong Range Configuration
choices will likely be noticed on the gauge.
Improper Range Configuration
selected
5 to 25%
50%
Very common unless gauges checked before and after
each measurement to ensure the right Range is in use.
Improper use of reference tube for
pressurization
5%
25%
Pressurization is seldom used, but if the technician is
improperly trained, they may not set the equipment up
properly for this test.
Time averaging set too high or too
low
25%
5 to 10%
If the gauge is fluctuating too much it will be difficult to
read. If the time averaging is too high, the pressure may
have changed but that change is not reflected in the
reading.
Wind
25%
10%
These errors can be eliminated by long-term averaging or
by multiple pressure pickups.
Out of calibration
5%
1-50%
Gauges can go out of calibration in a week or may take 10
years. It is impossible to tell unless the readings seem
unreasonable.
Out of calibration with regular
checks
0.5%
1-2%
Regular gauge checks can eliminate most of the
calibration problems, by identifying large errors
immediately, and before erroneous test results can be
taken. It is unlikely that errors in excess of 2% would
occur if the gauges checked before each use.
Proper training can eliminate almost all of the above errors.
8.1 Pressing power button may not turn gauge On if battery is fully
discharged
When the gauge is fully discharged, pressing the power button will not start the gauge. It is necessary to
plug the gauge in to mains power using the USB-C cable and power adapter. When the gauge is being
charged, you will see a blinking light next to the charging port. Once the light remains steady, the gauge is
fully charged. From the fully discharged state, plugging USB-C into a computer may not provide enough
current to charge, the gauge must be plugged into an outlet to re-charge.
8.2 Calculated Result will be wrong if the Range and Device
installed on fan are different than those selected on the gauge
If the results just don't make sense, check to make sure the “Range” and “Device” selected on the gauge
are the same as the Range and Device being used. Each Device and Range configuration has its own

Retrotec DM32X Specifications

General

Brand	Retrotec
Model	DM32X
Category	Measuring Instruments
Language	English